Patek Philippe Flyback Chronograph Annual Calendar — Steel | Olive Green Dial | Ref. 5905/1A-001 | 2026
Reference: 5905/1A-001
Year: 2026
Condition: Brand New (one factory handling mark on caseback)
Case: 42mm polished steel | 14.13mm thick | 30m water resistance | Sapphire crystal | Sapphire display caseback
Bracelet: Integrated steel, contrasting polished and satin-brushed finishing | Patented Patek Philippe fold-over clasp, secured with four independent catches
Movement: Calibre CH 28-520 QA 24H | Self-winding | 4Hz / 28,800 vph | 45–55 hour power reserve | 402 parts | 37 jewels | 21K gold central rotor
Movement finishing: Patek Philippe Seal | Gyromax® balance | Spiromax® balance spring | Flyback chronograph with vertical clutch, central chronograph hand, 60-minute counter | Annual Calendar with day, date, month, and day/night indication in aperture
Dial: Sunburst olive green | White gold applied faceted baton-style hour markers | White gold faceted dauphine-style hands with white luminescent coating | Annual Calendar indications displayed along an arc
Set: Full set — box and papers included
Shipping: Insured overnight, US domestic
The 5905/1A is a genuinely rare thing in Patek's catalogue — a complicated watch in steel, combining a flyback chronograph with an Annual Calendar in a case that reads unmistakably sporty next to the precious-metal norm. The sunburst olive green dial gives the whole piece a casual, almost outdoorsy register, with the calendar indications arranged along an arc rather than stacked in apertures, and white gold faceted dauphine hands with luminescent coating keeping legibility sharp against the textured green.
At 42mm and 14.13mm thick, the polished steel case carries real wrist presence, and the integrated bracelet's contrasting polished and satin-brushed links close on Patek's patented fold-over clasp with four independent catches — a security detail rarely found outside the manufacture's sport references. One factory handling mark is present on the caseback; the watch is otherwise unworn and factory-fresh.
Inside is the calibre CH 28-520 QA 24H, a column-wheel flyback chronograph with vertical clutch and 60-minute counter built around the Annual Calendar mechanism — 402 parts and 37 jewels finished to the Patek Philippe Seal, with a 21K gold central rotor delivering 45 to 55 hours of power reserve. Brand new, 2026, full set.
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